A5957: Full-Bridge PWM Gate Driver

DISCONTINUED: This device is no longer in production. The device should not be purchased for new design applications. Samples are no longer available.

Date of status change: December 28, 2019.

Recommended Substitutions: For existing customer transition, and for new customers or new applications, refer toA4955andA4956.

Designed for pulse-width-modulated (PWM) control of DC motors, the A5957 is capable of 50 V operation and provides gate drive for an all N-channel external MOSFET bridge.

Input terminals are provided for use in controlling the speed and direction of a DC motor with externally applied PWM control signals. Internal synchronous rectification control circuitry is provided to lower power dissipation during PWM operation.

Internal circuit protection includes VDS protection, thermal shutdown with hysteresis, undervoltage monitoring of VBB, and crossover-current protection.

The A5957 is supplied in a low-profile, 4×4 mm, 20-contact QFN package (suffix “ES”) with exposed thermal pad.

• PHASE/ENABLE/SLEEPn control logic
• Overcurrent indication
• Adjustable off-time and blank-time
• Adjustable current limit
• Adjustable gate drive
• Synchronous rectification
• Internal UVLO
• Crossover-current protection
• MOSFET VDS protection
• Voltage output proportional to load current